FAQ

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What size of boiler is required?
We recommend that you seek assistance from a local installer in understanding and assessing your precise requirements. If you need help in finding a local installer we may be able to help. Please complete the enquiry form.

The boiler needs to be sized to suit the size of your property. To find the boiler required multiply the total floor area of your property x the ceiling height in metres. This will give the volume in cubic metres.

Take the Length x Breadth x Ceiling Height of each room, then multiply this figure by 60.This will give the output in Watts. Divide this by 1000 which will give the KW. Choose a boiler which has this output.

BOILER SIZE= CUBIC VOLUME OF PROPERTY x 60 DIVIDED BY 1000.

Electricity Tariff Examples?
Domestic and Economy 2000 – SCOTTISH POWER

Economy 10 Scotland – SCOTTISH HYDRO

Economy 10- ENGLAND/ WALES SCOTTISH SOUTHERN ENERGY

Economy 7 – SCOTLAND/ ENGLAND/ WALES MOST PROVIDERS

ELECTRICITY TARIFF EXAMPLES

Scottish Power Economy 2000
Scottish power Economy 2000 tariff for example provides 18hrs of low rate electricity per 24 hour period, interrupting the supply at times of maximum power station demand for 3×2 hour periods per day. Approximate shut down periods are 8.00am until 10.00am, 4.30pm until 6.30pm and from 12.00am until 2.00am.

Scottish Hydro Economy 10

The E10 tariff from Scottish Hydro provides 10 low rate hours in a 24hr period. The low rate hours are 4.30am-7.30am, 1.30pm-4.30pm and 8.30pm-12.30am.
Scottish & Southern Energy Economy 10
The E10 Tariff from Scottish & Southern Energy provides 10 low rate hours in a 24hr period. The low rate hours are 00.00- 5.00, 13.00 – 16.00, 20.00 – 22.00.

Note: please check with all providers for current rates for both off peak and full rate electricity

Choosing a Tariff

To ensure the most economical use of your boiler you must choose a tariff which provides off peak electricity.

The two main Electric Wet Tariffs are:

  • Domestic and Economy 2000 provided by Scottish Power but only for electric wet storage boilers like the THERMAflow and only within their region (Between the border of Scotland and Perthshire approximately. If you provide us with your postcode via the quick enquiry form we can check if the tariff is available to you.)
  •  E10 provided by Scottish and Southern Energy or Scottish Hydro.

We recommend Scottish Power if it is available to you as it provides longer periods of off peak electricity.

If you have to use the E10 then we recommend installing the largest suitable Thermaflow Boiler possible. The larger the boiler, the more energy it can store and the cheaper the running costs can be.

What's the Thermaflow advantage?

To make most benefit of the low rate you would need to have the unit charge up as much as possible in the low rate periods and activate the heating control to come on an hour and a half before the low rate period ends this means you have heated your house up to temperature and recharged the boiler up to maximum temperature before the low rate period ends.

Depending on the individuals lifestyle, you may have to time the off peak control box to run into the higher rate periods as the heat remaining in the boiler will only last about an hour for heating and will have enough heat in the hot water section to provide one or two showers.

On the last low rate period in the evening you would time the off peak controller to switch off an hour before when the heating system runs until as this will deplete the heat from the boiler ready for recharging during the next low rate period.

So put simply we want to deplete the heat from the boiler before the beginning of the low rate period and activate the heating system before the end of the low rate period to allow us to heat the property and recharge the boiler with low rate electricity.

Where to purchase?
THERMAflow boilers are available for purchase from all leading plumbing and heating merchants throughout the UK or from various online companies. If you are interested in having a THERMAflow boiler installed please firstly contact a qualified installer to assist with planning and specifying your system. If you would like us to pass on your details to a qualified installer please complete this enquiry form

Who can fit?

Any qualified installer can assist with the design and specification of your heating system, as well as the supply and installation of your new system.
If you would like to arrange for a qualified installer to contact you click here to use our online enquiry form.

Do I need a 9kw or 12kw input boiler?
When you have calculated your requirements and decided what boiler you require you must check you have an adequate power supply to carry the load.

If you require a 9kw input then you require a minimum of 80Amp main fuse on your incoming supply.
If you require a 12kw input then you will require a minimum of 100Amp fuse on your incoming supply.
You cannot operate an electric shower along with the boiler as this will overload the supply.

There are two ways around this challenge:
A: You either change the shower to a high pressure mixer shower which will use hot water from the boiler or,
B: Your electrician will advise you on disconnection switch gear which disconnects the supply to the boiler when the pull cord or switch for your electric shower is turned on.

The power to the boiler will be resumed when the electric supply to the shower is turned off.
You must remember to turn the supply off when you are finished using the shower.

How much will it cost to run?

“You’ll be amazed at the savings on running costs you can make AND the vessel on our combi boiler is guaranteed for 25 years so no need to replace as often as Gas and some other electric boilers.”

Running Costs= A combination of various factors but to simplify, multiply the heat output required x tariff rate.

This will give you the cost to heat your entire home for one hour during winter. This will reduce as the outside temperature increases.

You can reduce running costs by closing off radiators in rooms that are unused: Eg, If your home has 7 radiators with outputs of 1-5 Kw and the tariff rate is 10p per Kw/Hr it will cost 15p per hour to run one radiator.

No of Radiators x Radiator Output x Tariff Rate/Kw/Hr x Hours of Use = Cost Per Day

How efficient is the boiler?
The Thermaflow boiler is 100% efficient. For every KW/HR input of electrical energy you will receive the same output in heat energy towards heating and hot water.

With a Gas boiler if you input £1 of Gas you will get 80p back out in heat energy as 20p is thrown out through the flue to the atmosphere.

Why should I buy the Thermaflow boiler?
The Thermaflow has a 25 year guarantee on the body of the boiler.

The Thermaflow range of boilers will provide between 20-30 litres of mains pressure hot water per minute at 50˚C.
The Thermaflow boilers have a large list of approvals – unlike many boilers on the market.
The Thermaflow boilers provide heating & hot water from the same unit.
Flow boilers require a separate hot water vessel.
Saving of between £300 & £1200 per year can be achieved by using the Thermaflow boiler in conjunction with our off peak controller (depending on size of boiler and tariff).
This function cannot be implemented with a flow (direct acting) boiler as they cannot store any energy.
You would have to replace a flow boiler 2-3 times in the lifetime of a Thermaflow.
When first turning your central heating on, the Thermaflow will heat the radiators to a temperature of 75˚C in 3 minutes where as a Flow boiler of the same input will take around 25 minutes to heat your radiators to 75˚C.
The Thermaflow will give you water at your taps at a temperature of 50˚C within 20 seconds depending on length of dead leg.
The Thermaflow will fill a bath with 100 litres of water at 50˚C within 4-5 minutes.
Quiet in operation.
The Thermaflow boiler can accept energy from thermal solar panels, log burning stoves with a water jacket etc.
Using the Thermaflow eliminates the need to purchase a separate hot water vessel.

How do I benefit from the Scottish Power Economy 2000 tariff?
Scottish power Economy 2000 tariff for example provides 18hrs of electricity per day at 6.70p/Kw hr.
Interrupting the supply at times of maximum power station demand for 3×2 hour periods per day.

Approximate shut down periods are 8.00am until 10.00am, 4.30pm until 6.30pm and from 12.00am until 2.00am.
(Note : check for up to date tariffs & rates with energy supplier).

How do I benefit from the Scottish & Southern Energy Economy 10 Wet Electric tariff?
The E10 Wet electric Tariff from Scottish & Southern Energy provides 10 reduced rate hours in a 24hr period. The reduced rate hours are as follows:
00.00- 5.00, 13.00 – 16.00, 20.00 – 22.00. The full property is reduced rate within these hours.
To make most benefit of the reduced rate you would need to have the unit charge up as much as possible in the reduced rate periods and activate the heating control to come on an hour and a half before the reduced rate period ends this means you have heated your house up to temperature and recharged the boiler up to maximum temperature before the reduced rate period ends.
Depending on the individuals lifestyle, you may have to time the off peak control box to run into the higher rate periods as the heat remaining in the boiler will only last about an hour for heating and will have enough heat in the hot water section to provide one or two showers.
On the last reduced rate period in the evening you would time the off peak controller to switch off at 22.00 if the heating system runs until 23.00 this will deplete the heat from the boiler ready for recharging at midnight.
So put simply we want to deplete the heat from the boiler before the beginning of the reduced rate period and activate the heating system before the end of the reduced rate period to allow us to heat the property and recharge the boiler with reduced rate electricity.
(Note : check for up to date tariffs & rates with energy supplier).
Why Should I Buy a Thermaflow Boiler Rather Than a Direct Acting or Flow Boiler?
  • The Thermaflow has a 25 year vessel guarantee.
  • The Thermaflow range of boilers will provide mains pressure hot water.
  • The Thermaflow boilers have a large list of approvals unlike many boilers on the market.
  • The Thermaflow boilers provide heating and hot water from the one unit. Flow boilers require a separate hot water vessel.
  • The Thermaflow boiler will run up to 40% less than a flow boiler.
  • A Thermaflow boiler will last 2-3 times longer than a flow boiler.
  • Quiet in operation.
  • The Thermaflow boiler can be adapted to accept solar energy or heat generated from a wood stove.